Fix typed lowering of JSAdd on non-number inputs.

src/compiler/js-typed-lowering.h

Index: src/compiler/js-typed-lowering.h
diff --git a/src/compiler/js-typed-lowering.h b/src/compiler/js-typed-lowering.h
index ebd2d854bb4f62f2e51d1b3109e913bc6b8cf6bf..4a10092fa86a1ce294e4ee544c59bccf8cceeaff 100644
--- a/src/compiler/js-typed-lowering.h
+++ b/src/compiler/js-typed-lowering.h
@@ -26,6 +26,7 @@ class JSTypedLowering FINAL : public Reducer {
 
   JSGraph* jsgraph() { return jsgraph_; }
   Graph* graph() { return jsgraph_->graph(); }
+  Zone* zone() { return jsgraph_->zone(); }
 
  private:
   friend class JSBinopReduction;